The Xcode Cloud TestFlight Build setting was set to "Latest Release or Beta" and Apple had updated its tool chain to Xcode 15.3 beta 2 (15E5188])
Switching back to Xcode 15.2 (15C500b) solved it.
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There is no problem with the phase animator.
If I do this
struct ContentView: View {
@State var img1 = UIImage(systemName: "gear")!
@State var img2 = UIImage(systemName: "gear")!
var body: some View {
PhaseAnimator([1, 2]) { phase in
Image(uiImage: phase == 1 ? img1 : img2)
.renderingMode(.template)
.foregroundStyle(.white)
.background(.black)
}
}
}
It exactly does blend as expected. It blends two images (with identical content) and you will not see a pumping effect.
The problem starts, when I create an UIImage with UIGraphicsBeginImageContext like with the resize function in my first post. Then the two identical images are pulsating.
PhaseAnimator([1, 2]) { phase in
Image(uiImage: phase == 1 ? img1 : img2)
.renderingMode(.template)
.foregroundStyle(.white)
.background(.black)
}
.task {
img1 = self.resizeImage(image: img1, newWidth: widgetSize)
img2 = self.resizeImage(image: img2, newWidth: widgetSize)
}
(And yes, UIGraphicsBeginImageContext is deprecated, but it does not matter, the same behaviour can be observed using UIGraphicsImageRenderer)